This command changes the apparent vocal tract size of the second selected Sound to match that of the first selected Sound.
It combines the process used in Calculate vocal tract length to estimate the vocal tract lengths of both Sounds, and the command Change vocal tract size to modify the second selected Sound by formant shift.
The resulting new Sound will appear selected in the list of objects.
This script is adapted from the procedure described at:
Code in R by Romeo Mlinar:
Original formula from Johnson, Keith. Acoustic and Auditory Phonetics. 2nd ed. Malden, Mass: Blackwell Pub, 2003. p. 96